Hi,
We have tried opening your project and could not reproduce the error. So it must be caused by something else (opening it from command line or some global setting you are using). We would be happy to pinpoint and resolve this, but we would need to know more about the circumstances of the error. It would definitely help us if you could try starting an empty VS instance and opening the project via File->Open->Project/Solution and let us know if the problem still persists.